Scott E. Palmer, V.M.D. Diplomate, A.B.V.P., Eq. Practice New Jersey Equine Clinic
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2 Scott E. Palmer, V.M.D. Diplomate, A.B.V.P., Eq. Practice New Jersey Equine Clinic
3 Hemostasis Inflammation Proliferation Remodeling
4 Inflammation Matrix production Angiogenesis Epithelialization Remodeling
5 Systemic factors Age Medical co-morbidities Local environmental factors Bacterial load Degree of inflammation Oxygen tension Vascular perfusion
6 Injury Kinins Platelets Inflammation / Local Hypoxia Epithelial Cells Macrophage Lymphocyte Mast Cell Granulocyte Fibroblasts Collagen Lysis / Collagen Synthesis Remodeling Proliferation / Contraction Healed Wound
7 Support the processes that promote wound healing Eliminate processes that impair wound healing
8 Expression of growth factors VEGF, TGF-B1 & IGF-1 Reduces inflammation Dose-dependent
9 R05 or R20 mm probe Energy flux density of 0.11 mj/mm Pulses, Q 7 days
10 Morgan DD, et al. JAVMA 2009, 234(9) Healing time for treated wounds (76 days) was significantly shorter than that of untreated wounds (90 days). ESWT may stimulate healing of wounds of the distal portion of the limbs in horses. Although the mechanism by which healing was stimulated could not be identified, extended expression of growth factors likely played a role.
11 Silveira A, et al. AJVR 2010, 71(2) Treatment with ESWT did not accelerate healing of equine distal limb wounds, but treated wounds had less exuberant granulation tissue and appeared healthier than controls. ESWT may be useful to prevent exuberant granulation tissue formation and chronic inflammation of such wounds, but further studies are necessary before recommending ESWT for clinical application.
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13 Provides metabolic substrate (Oxygen) Reduces inflammation (Vasoconstriction) Kills bacteria (increased killing capacity of neutrophils & potentiates aminoglycosides) Suppresses toxin synthesis Stimulates growth factors & up-regulates receptors Activates & mobilizes stem cells
14 After 7 days of exposure to HBO 2 at 2 ATM cell proliferation was enhanced compared with controls. Secretion of growth factors (BFGF & VEGF) was increased in response to HBO 2 exposure. HBO 2 exposure at 2 ATM enhanced the growth of fibroblasts, directly effecting fibroblast production of autocrine growth factors as the result of changes in cell signaling pathways. Oxygen dosage was critical.
15 Exposure to HBO 2 mobilized stem/progenitor cells from the bone marrow by a nitric oxide-dependent mechanism. The population of stem cells in the peripheral circulation of humans doubled in response to a single exposure to 2 ATA for 2 hours. Pre-treatment of wild mice with a NO synthase inhibitor prevented the HBO 2 induced elevation in stem cell factor and circulating stem cells.
16 Oxidative stress from HBO 2 (2.8 ATM) exerts a trophic effect on vasculogenic stem cells. In a mouse model, circulating stem/progenitor cell recruitment & differentiation were stimulated by HBO 2 and by a physiological oxidative stressor, lactate. In combination, HBO 2 and lactate had additive effects. By causing an oxidative stress, HBO 2 activates a physiological redox-active autocrine loop in stem/progenitor cells that stimulates vasculogenesis by increasing the numbers of SPCs in blood and by increasing levels of cellular transcription factors.
17 The final common pathway for SPC activation is stabilization and stimulation of HIF (hypoxic inducible factor) that turns on genes that make VEGF and SDF-1 which recruit SPCs. Tissue hypoxia is a constant natural stimulus through up-regulation of VEGF. HBO 2 creates increased reactive oxygen synthase, which in turn activates the thioredoxin loop which stabilizes HIF.
18 The final common pathway for SPC activation is stabilization and stimulation of HIF (hypoxic inducible factor) that turns on genes that make VEGF and SDF-1 which recruit SPCs. Tissue hypoxia is a constant natural stimulus through up-regulation of VEGF. HBO 2 creates increased reactive oxygen synthase, which in turn activates the thioredoxin loop which stabilizes HIF.
19 The final common pathway for SPC activation is stabilization and stimulation of HIF (hypoxic inducible factor) that turns on genes that make VEGF and SDF-1 which recruit SPCs. Tissue hypoxia is a constant natural stimulus through up-regulation of VEGF. HBO 2 creates increased reactive oxygen synthase, which in turn activates the thioredoxin loop which stabilizes HIF.
20 The final common pathway for SPC activation is stabilization and stimulation of HIF (hypoxic inducible factor) that turns on genes that make VEGF and SDF-1 which recruit SPCs. Tissue hypoxia is a constant natural stimulus through up-regulation of VEGF. HBO 2 creates increased reactive oxygen synthase, which in turn activates the thioredoxin loop which stabilizes HIF.
21 The final common pathway for SPC activation is stabilization and stimulation of HIF (hypoxic inducible factor) that turns on genes that make VEGF and SDF-1 which recruit SPCs. Tissue hypoxia is a constant natural stimulus through up-regulation of VEGF. HBO 2 creates increased reactive oxygen synthase, which in turn activates the thioredoxin loop which stabilizes HIF.
22 The final common pathway for SPC activation is stabilization and stimulation of HIF (hypoxic inducible factor) that turns on genes that make VEGF and SDF-1 which recruit SPCs. Tissue hypoxia is a constant natural stimulus through up-regulation of VEGF. HBO 2 creates increased reactive oxygen synthase, which in turn activates the thioredoxin loop which stabilizes HIF.
23 The final common pathway for SPC activation is stabilization and stimulation of HIF (hypoxic inducible factor) that turns on genes that make VEGF and SDF-1 which recruit SPCs. Tissue hypoxia is a constant natural stimulus through up-regulation of VEGF. HBO 2 creates increased reactive oxygen synthase, which in turn activates the thioredoxin loop which stabilizes HIF.
24 The final common pathway for SPC activation is stabilization and stimulation of HIF (hypoxic inducible factor) that turns on genes that make VEGF and SDF-1 which recruit SPCs. Tissue hypoxia is a constant natural stimulus through up-regulation of VEGF. HBO 2 creates increased reactive oxygen synthase, which in turn activates the thioredoxin loop which stabilizes HIF.
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27 Provides concentrated growth factors by separating platelets & plasma from red & white blood cells Protective fibrin matrix may be injected into a wound or used as a wound dressing
28 Monteiro SO, Lepage OM, Theoret CL. AJVR (2) Topical application of autologous platelet-rich plasma did not accelerate or improve the quality of repair of small granulating wounds on limbs of horses. This treatment may better suit wounds with massive tissue loss or, alternatively, chronic wounds that would benefit from a fresh source of mediators to accelerate the healing process.
29 Lundquist R, Dziegiel MH, Agren MS. Wound Repair Regen (3) Platelet-rich fibrin provided sustained release and protection against proteolytic degradation of endogenous fibrogenic factors important for wound healing.
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31 Autologous Stem Cells Same horse source Allogeneic Stem Cells Other horse source
32 Mesenchymal Stem Cells Adipose Stem Cells Embryonic Stem Cells
33 Promotes proliferation of new blood vessels Stimulates growth factors Favors growth of normal tissue vs. scar tissue
34 Local infiltration Regional Limb Perfusion Intra-articular administration
35 Tourniquet placed above carpus for 45 min IA & IV administration of stem cells tagged with TcHMPAO 100% retention while tourniquet was in place Retention 6 Hours after administration: IA - 39%, good diffusion in hoof & pastern IV 28%, 50% diffusion in hoof & pastern
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37 Widely used in human medicine. Creates sub-atmospheric pressure at the wound surface. Adjunctive therapy Used in conjunction with routine care.
38 Phases of Wound Healing Inflammation Proliferation Remodeling Hemostatis Cleaning / Debridement Disinfection Edema / Exudate Management Wound Volume Reduction Closure / Epithelial. Remodeling / Scar Management V.A.C. Therapy
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40 Therapy Unit - provides intermittent/continuous sub-atmospheric pressure.
41 Tubing & Canister - regulate pressure at wound site and collect exudate.
42 Hydrophobic polyurethane foam dressing - helps to promote granulation tissue formation / wound contraction micron pores
43 Combines antimicrobial effect of silver ions with sub-atmospheric pressure.
44 Promotes granulation tissue formation Reduces tissue edema & Promotes perfusion Removes exudate & infectious material
45 Mass of hematoma/seroma, g 60 Hematoma/Seroma p = ± (mean) ±3 (SE) 10 0 Prevena Therapy Semi-occlusive transparent film dressing Porcine model hematoma/seroma formation was reduced after 4 days of negative pressure therapy (p=0.01)
46 Acute & chronic wounds Dehisced wounds Pressure ulcers Flaps / grafts Closed surgical incisions
47 Remove hair adjacent to wound (5 to 10 cm margin) Thoroughly clean & debride wound Apply tag cement to adjacent skin Apply V.A.C. GranuFoam dressing, drape & pad.
48 Connect sensat.r.a.c. tubing to therapy unit. Initiate V.A.C therapy at PSI Monitor and treat for 48 hours Remove foam dressing and re-apply PRN
49 Case Example: Kick Wound Treatment Uutilizing V.A.C. Therapy
50 Case Example: Kick Wound Treatment Uutilizing V.A.C. Therapy Sx
51 Case Example: Kick Wound Treatment Uutilizing V.A.C. Therapy
52 Case Example: Kick Wound Treatment Uutilizing V.A.C. Therapy Effective adjunctive treatment for difficult wounds Logistical issues may be challenging
53 Case Example: Kick Wound Treatment Uutilizing V.A.C. Therapy Effective adjunctive treatment for difficult wounds Logistical issues may be challenging
54 Case Example: Negative Pressure Therapy Used with a Closed Incision V.A.C. Therapy Porcine Incision 5 days Post-op - Control Porcine Incision 5 days Post-op V.A.C. Therapy Incision tensile strength 6-10 times greater than control after 3 days of Negative Pressure Therapy * Data courtesy of Dr. Yaszay, Children s Specialist Foundation
55 Case Example: Mare neck injury treatment utilizing V.A.C. Therapy Courtesy Dr. Booth, KCI Day 0 Day 3 Day 13 Day 22
56 Case Example: Foal with Frostbite V.A.C. Therapy - Courtesy Dr. Booth, KCI
57 Hyperbaric Oxygen Therapy is often used in combination with stem cells & growth factor treatment. Hyperbaric Oxygen Therapy is also used in conjunction with V.A.C. wound therapy.* *V.A.C. Therapy Unit should not be taken into a HBOT chamber Do not clamp tubing prior to HBOT treatment session.
58 Thank You & Enjoy the Hambletonian!
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